Remember that there is another portion of the fuel system that you might consider....I overlooked it orginally when getting my system overhauled on the front engine. I was having issues with the high/low fuel flow settings, and they tried a bunch. I then overhauled the spider, fuel pump, cleaned injectors, adjusted fuel flow to book specs....then finally someone said - hey, what about the throttle body. Tried one from another Skymaster, and problem went away. I sent mine out for overhaul, and all has been good on that issue since (over a year now).
On a related note -- I mentioned all the issues to another a&p about a month later, without telling him the fix. he said, just replace the throttle body with an overhauled one. Says he keeps an extra one lying around for troubleshooting. Go figure, never know which mechanic will have which little jewel of information. Guess that's why we all try to share info on this website, eh?
________
HOW TO MAKE A VAPORIZER